Blower



July 13 1939- A. G. suTcLlFFl-z y 2,166,647

- BLOWER` l Filed Feb. zo, 1937 l l; I l A li 1a li Zi I I a li? gg I Ml f. f 4 A f l J 20 J7 Zl/T o EO 0 o ,Il 1/ I Patented July 18, 1939 UNITED STATES PATENT OFFICE BLOWER Application February 20, 1937, Serial No. 126,741

2 Claims.

This invention relates to the art of blowers.

and has reference more particularly to blowers wherein an electric motor or a belt pulley or gear that drives the blower wheel or rotor is mounted directly on a side wall of the motor casing, with the blower wheel or rotor directly mounted on the inner end of the motor or pulley or gear shaft.

Where an electric motor, pulley, gear or other rotor driving member is mounted on the side wall of the casing by rigid all metal attaching means, as has heretofore been the case so far as I am aware, the blower is in some cases noisy, especially when operated at high speeds. This is due mainly, if not entirely, to the transmission of the 16 vibrations'of the rotor driving member to the side wall of the blower casing which acts as a diaphragm-especially where the side wall is of sheet metal-and creates a very audible hum. And this is true, but to a lesser degree, where the side wall may be a cast metal plate. These blowers are very extensively used in churches, theaters, lecture halls, and other public auditoriums and, even when located in the basement of the building, may be distinctly audible in the auditorium and, of course, the noise which they emit might be or may be unpleasant and annoying to both speaker and audience.

'I'he main object of this invention has been to provide a blower of the type or class referred to that will be practically noiseless in operation and will thus obviate this noise nuisance; and this object I attain, in accordance with the principle of the invention, by interposing in the attaching means of the electric motor or other rotor driving member to the casing an improved vibrationabsorbing and sound-deadening means that substantially bars the transmission of the motor vibrations to the casing wall, and creates a virtually silent blower. This noise eliminating means is incorporated in and forms a part of the means by which the usual spider or other motor-supporting member is non-separably attached to the side wall of the blower casing.

Another object of the invention has been to provide a very simple, eillcient, and inexpensive form of such noise-eliminating attaching means, and one of such a character that if the vibration-absorbing element thereof should break or otherwise fail in its supporting function, the

motor or other rotor driving member cannot fall away from the casing.

Still other objects and attendant advantages of the invention will be apparent to persons skilled in the art from the following detailed description,

taken in connection with the accompanying drawing, in which I have illustrated two practical and approved embodiments of the principle of the invention as embodied in a so-called direct connected blowers, and wherein- Fig. 1 is a side elevation of a blower, having my improvement applied thereto.

Fig. 2 is a vertical section, taken on the line 2 2 of Fig. 1. f

Fig. 3 is an enlarged fragmentary section, taken on the line 3-3 of Figs. 1 and 2.

Fig. 4 is an enlarged fragmentary section, taken on the line 4--4 of Fig. 1.

My invention, in an approved form thereof illustrated in Figs. 1 to 4 inclusive, takes advantage of the fact that a process has been discovered for causing rubber to strongly adhere to metal surfaces, such process consisting mainly in brass plating the metal surfaces. In the drawing, I0 designates as an entirety a blower casing of the usual form, supported'v on legs II. The two side walls of the blower casing have the usual large opposed openings I2 and I3 through the latter of which the air is drawn by the blower wheel and discharged tangentially through the discharge end I4. Closing the opening I2 is the usual dished guard plate I5, through which extends the shaft I6 of an electric motor I1, and keyed on the inner end of shaft I6 is the rotor or blower wheel I8 of the customary type. The parts as thus far described are, or may be, all as usual in blowers of this direct-connected type.

The motor I1 is supported by a spider comprising a ring I9 and radial arms 20, to the outer ends of which are attached by bolts 2| a ring 22. This ring lies directly opposite the marginal portion of the opening I2 in one side wall o-f the blower casing. The ring 22, at four equally spaced points, is locally offset outwardly as shown at 22' in Fig. 3, and to the inner side of this offset portion are secured by screws 23 brackets 24, the inner free edges of which are formed with integral, inwardly-extending flanges 25. A U-shaped bracket 26 is attached by a screw 21 to the opposite marginal portion of the side wall of the casing and the free ends of the limbs of this bracket have outwardly directed iianges 2B, which, as shown in Fig. 3, overlap the flanges 25, and between the brackets 24 and 26 is a solid body 29 of rubber, that is strongly adhered to the walls of the brackets. The flanges 25 and 28 of the brackets are embedded in this body of rubber, and since the ilanges 25 overlap the iianges 28, the motor support cannot become detached from the wall of the casing even though the rubber body should crack or break.

'Ihespiderring!2,asisshowninthe drawing, is a iia't, relatively thin and wide metal ring which a certain degree of flexibility, and by attaching the outer ends o! the spider arms 2l to said ring at points between, and most eilectively midway between, the points of attachment of the brackets 2l, the vibration absorbing'capacity o! the ring is added to the vibration absorbing capacity of 'the ilexible connectors through which the ring is attached to the side wall of the blower casing.

Practical tests made with blowers constructed as above described have proved that4 the vibrations set up by the motor and blower wheel under high speed are so eiiectively absorbed by thev rubber element oi the connecting means that they are not transmitted to the casing wall and hence the blower is virtually silent in its operation.

By the term motor as used in the claims is intended an electric motor, or a belt pulley, or a gear wheel, or any other motor-shaft drive mounted on the blower casing.

While I have illustrated and described practical and emcient embodiments of the invention, I do not limit the latter to the details of structure and arrangement herein illustrated, but reserve such variations, modiiications and mechanical equivalents as fall within the spirit and purview of the claims.

I claim:

i. In a blower, the combination with the blower casing, a motor, and a blower wheel in said casing directly mounted on the motor shaft, of means for mounting said motor on a side wall ot saidr g engaging parts preventing their separation from'Y each other, and a body of rubber between and connecting said brackets and in which said interengaging parts are embedded.

2. In a blower, the combination with the blower casing, a motor, and a blower wheel in said casing directly mounted on the motor shaft, of means ior mounting said motor on a side wall of said casing comprising a spider having a hub encircling the motor frame, radial arms, and a ring on the outer ends of said arms, a plurality of pairs of opposed brackets secured respectively to said side walls and ring, the brackets oi' each pair being formed with inter-engaging parts preventing their separation from each other, and a body of rubber between and connecting said brackets and in which said inter-engaging parts are embedded.

ARTHUR G. SUIUIJFFE. 

